Hi there Ally --
I'm sorry that you are feeling hurt and disrespected by your friend.
The words that jump out at me are that you know about your Best Friend's behavior (hereafter BFr) because a third-party friend (#3) was kind enough to fill you in. I see nothing kind about #3 sharing this hurtful information.
Secondly, you must remember that #3 is giving you a second-hand report; everything she tells you is filtered through her perspective and shaped by her own values, needs, experiences, attitudes, wants and desires. In fact, hearsay evidence such as that presented to you by #3 is generally not allowed in a course of law. As a result, you are basing a decision about whether BFr is a friend/not friend on the basis of what could be a higly distorted report.
Perhaps you can find some materials to educate BFr online. I would pick something short, so that BFr is not overwhelmed.
It is true, as Fayerody write, that sometimes we lose people from our lives who do not understand or cannot cope with our mental and emotional disabilities. This is very sad, but it happens.
I am so sorry that it is happening to you.
__________________
|